Acidic property of modified ultra stable Y zeolite: increase in catalytic activity for alkane cracking by treatment with ethylenediaminetetraacetic acid salt

被引：89

作者：

Katada, N ^{[1
]}

Kageyama, Y ^{[1
]}

Takahara, K ^{[1
]}

Kanai, T ^{[1
]}

Begum, HA ^{[1
]}

Niwa, M ^{[1
]}

机构：

[1] Tottori Univ, Fac Engn, Dept Mat Sci, Tottori 6808552, Japan

来源：

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 2004年 / 211卷 / 1-2期

基金：

日本学术振兴会;

关键词：

ultra stable Y zeolite; alkane cracking; bronsted acid site; temperature-programmed desorption of ammonia; ethylenediaminetetraacetic acid treatment;

D O I：

10.1016/j.molcata.2003.10.001

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Temperature-programmed desorption (TPD) of ammonia with improved techniques was applied to quantitative determination of the strength and number of acid sites of a series of modified Y zeolites. A weak acid site was generated by the isomorphous substitution of aluminum for silicon, and the strength was independent of the aluminum concentration. This type of acid site showed almost no activity for cracking of octane at 573 K. Multiple types of extra-framework aluminum were formed on the ultra stable Y (USY) zeolite by steaming to create the cracking activity. Strong Bronsted acid sites were increased by the treatment of USY with a sodium salt of ethylenediaminetetraacetic acid (EDTA). The catalytic activity for alkane cracking showed a positive relationship with the number of this type of acid site, suggesting that the active site of USY for the catalytic cracking is this strong Bronsted acid site. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：119 / 130

页数：12

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